For what they're worth, the games have no replay value and cost about as much as a theater ticket, and one's expectations should be based as such. They rely on the player learning the mechanics as they go. Once they learn everything there is to be learned, it becomes more algorithmic than anything else and yes, it loses the horror value at that point (the original FNAF's night 7 is very guilty of this). But that's why you don't read or watch anything about the game before playing it.

FNAF2 is a fair spike in difficulty, both because wearing the mask prevents you from doing anything else and because of the sheer amount of shit you have to look out for. I have to get around to finishing the sequel sometime, but night 2 was already more stressful than anything out of the original.

Though I'm a bit disturbed by how fast this guy is churning these out. I think I'd rather see him try something new.

He did initially intend for the second FNAF to be released this year as opposed to november last year, but there were problems he had with the demo (or something; I only learned of this through Markiplier's play through).

Admittedly, they do lose their scare value, which is sad. Still fun to watch some new fellow play the game for the first time and watch them squirm in response, if you wanted a silver lining.

If there was anything that could be improved with this series, it would involve being able to move around the building and more places to hide.

For bonus info, the developer of the games, Scott Cawthon, is christian and makes his games as bloodless as possible. That, and he got the idea for this one from one guy commenting on a beaver character in one of his games being more creepy than cute (he took that as a dare that he could make a beaver scary).